@keyframes _si{to{opacity:1}}

.legacy-content .lesson-header {position:relative;overflow:hidden}.legacy-content .lesson-header:after {content:"";position:absolute;right:-70px;top:-70px;width:220px;height:220px;border:1px solid rgba(77,107,254,.24);border-radius:50%;box-shadow:0 0 0 26px rgba(77,107,254,.05),0 0 0 52px rgba(77,107,254,.028)}.legacy-content .lesson .sec-label {margin:56px 0 20px}.legacy-content .objective {display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:center;background:linear-gradient(135deg,var(--accent-soft),rgba(255,255,255,.75));border:1px solid rgba(77,107,254,.28);border-radius:var(--radius);padding:24px;margin:24px 0 32px}.legacy-content .objective svg {color:var(--accent)}.legacy-content .objective b {display:block;color:var(--accent);margin-bottom:6px}.legacy-content .objective span {font-size:14px;line-height:1.9;color:var(--text)}.legacy-content .prose {font-size:15px;line-height:2;color:var(--text);margin:0 0 20px}.legacy-content .src-note {font-size:12.5px;color:var(--sub);line-height:1.8;margin:-8px 0 20px}.legacy-content .src-note code {font-size:11.5px}.legacy-content .facts {display:grid;grid-template-columns:1fr;gap:20px;margin-top:20px}.legacy-content .fact {background:var(--card);border:1px solid var(--border);border-radius:12px;padding:24px;box-shadow:var(--shadow-card)}.legacy-content .fact code {color:var(--accent);font-weight:800}.legacy-content .fact p {font-size:14px;line-height:1.9;color:var(--sub);margin:9px 0 0}.legacy-content .core-visual {background:var(--card);border:1px solid rgba(77,107,254,.25);border-radius:18px;padding:24px;margin:24px 0;box-shadow:var(--shadow-card)}.legacy-content .core-visual svg {width:100%;height:auto;display:block}.legacy-content .visual-caption {font-size:12.5px;color:var(--sub);text-align:center;margin-top:12px;line-height:1.7}.legacy-content .source {background:#fff;border:1px solid var(--border);border-radius:14px;overflow:hidden;margin-top:12px;box-shadow:var(--shadow-card)}.legacy-content .source-head {display:flex;justify-content:space-between;gap:12px;padding:12px 18px;background:var(--accent-soft);color:var(--accent-deep);font:12px ui-monospace,SFMono-Regular,Menlo,monospace}.legacy-content .source pre {margin:0;padding:20px;overflow:auto}.legacy-content .source code {color:var(--text);font:12.5px/1.75 ui-monospace,SFMono-Regular,Menlo,monospace;background:none;padding:0}.legacy-content .kw {color:#3450d4}.legacy-content .ty {color:#7c3aed}.legacy-content .fn {color:#0891b2}.legacy-content .cm {color:#9ca3af}.legacy-content .str {color:#16a34a}.legacy-content .snapshot {margin-top:14px;padding:14px 18px;border:1px solid var(--border);border-radius:8px;background:var(--bg);font-size:12px;line-height:1.8;color:var(--sub)}.legacy-content .snapshot code {color:var(--text)}.legacy-content .doc-quote {margin-top:12px;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px 22px;box-shadow:var(--shadow-card)}.legacy-content .doc-quote .dq-path {font:700 11px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent);overflow-wrap:anywhere;margin-bottom:8px}.legacy-content .doc-quote blockquote {margin:0;font-size:14px;line-height:1.9;color:var(--text)}.legacy-content .exercise {display:grid;grid-template-columns:52px 1fr;gap:18px;background:linear-gradient(135deg,#f0f3ff,var(--card));border:1px solid rgba(77,107,254,.3);border-radius:14px;padding:24px;margin-top:12px}.legacy-content .exercise-num {width:46px;height:46px;border-radius:12px;background:var(--accent);color:white;display:grid;place-items:center;font-weight:900}.legacy-content .exercise h3 {margin:0 0 10px;color:var(--text);font-size:16px}.legacy-content .exercise p {margin:0;color:var(--sub);font-size:14px;line-height:1.9}.legacy-content .takeaway {margin-top:32px;padding:24px;border-radius:14px;background:var(--accent-soft);border:1px solid rgba(77,107,254,.28);color:var(--text);display:flex;gap:14px;line-height:1.9;font-size:14px}.legacy-content .takeaway svg {flex:0 0 auto;color:var(--accent)}.legacy-content .takeaway b {color:var(--accent-deep)}.legacy-content .demo {background:var(--card);border:1px solid rgba(77,107,254,.25);border-radius:18px;padding:28px;box-shadow:var(--shadow-card)}.legacy-content .demo-bar {display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:20px}.legacy-content .demo-scenarios, .legacy-content .demo-ctrl {display:flex;gap:12px;flex-wrap:wrap}.legacy-content .demo button {display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:8px 15px;border-radius:10px;border:1px solid var(--border);background:var(--bg);color:var(--text);font:600 13px/1.2 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;cursor:pointer;transition:background .2s,border-color .2s,color .2s}.legacy-content .demo button.active, .legacy-content .demo button:hover {border-color:var(--accent)}.legacy-content .demo button.active {background:var(--accent);color:#fff}.legacy-content .demo button svg {flex:none}.legacy-content .ed-stage {display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:12px;align-items:stretch}.legacy-content .ed-box {background:var(--bg);border:1.5px solid var(--border);border-radius:14px;padding:12px;transition:border-color .3s,box-shadow .3s;display:flex;flex-direction:column}.legacy-content .ed-box.on {border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.legacy-content .ed-box.bad {border-color:rgba(220,38,38,.55)}.legacy-content .ed-box.ok {border-color:rgba(22,163,74,.5)}.legacy-content .ed-head {display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:2px}.legacy-content .ed-head b {font:800 12px/1.4 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;color:var(--accent-deep)}.legacy-content .ed-sub {font-size:11px;color:var(--sub);margin-bottom:10px;line-height:1.5}.legacy-content .ver-badge {font:800 11px/1 ui-monospace,Menlo,monospace;background:#fff;border:1px solid rgba(77,107,254,.35);color:var(--accent-deep);border-radius:999px;padding:5px 10px;transition:transform .3s}.legacy-content .ver-badge.pop {animation:edpop .45s ease}@keyframes edpop{50%{transform:scale(1.35)}}.legacy-content .ed-file {background:#fff;border:1px solid var(--border);border-radius:10px;padding:10px 12px;font:11.5px/1.85 ui-monospace,Menlo,monospace;color:var(--text);flex:1}.legacy-content .ed-file .fl {display:flex;gap:8px;border-radius:4px;padding:0 4px;transition:background .3s}.legacy-content .ed-file .fl .ln {color:#9ca3af;flex:none;width:18px;text-align:right}.legacy-content .ed-file .fl.hl {background:var(--accent-soft)}.legacy-content .ed-file .fl.dup {background:rgba(217,119,6,.14)}.legacy-content .ed-file .fl.new {background:rgba(22,163,74,.12)}.legacy-content .ext-hand {display:inline-flex;align-items:center;gap:5px;font:700 11px/1 -apple-system,sans-serif;color:var(--amber);border:1px solid rgba(217,119,6,.45);border-radius:999px;padding:5px 9px;opacity:0;transition:opacity .3s}.legacy-content .ext-hand.show {opacity:1}.legacy-content .ledger {display:flex;flex-direction:column;gap:6px;flex:1}.legacy-content .ledger-row {display:flex;align-items:center;justify-content:space-between;gap:8px;background:#fff;border:1px solid var(--border);border-radius:9px;padding:8px 10px;font:11.5px/1.4 ui-monospace,Menlo,monospace;color:var(--text);transition:border-color .3s,background .3s}.legacy-content .ledger-row .obs {font-weight:800;color:var(--sub)}.legacy-content .ledger-row.seen .obs {color:var(--success)}.legacy-content .ledger-row.flash {border-color:var(--accent);background:var(--accent-soft)}.legacy-content .ledger-note {font-size:11px;color:var(--sub);line-height:1.6;margin-top:8px}.legacy-content .ed-verdict {display:flex;flex-direction:column;gap:8px;flex:1}.legacy-content .intent-chip {background:#fff;border:1px dashed rgba(77,107,254,.4);border-radius:9px;padding:8px 10px;font:11.5px/1.6 ui-monospace,Menlo,monospace;color:var(--accent-deep);min-height:38px}.legacy-content .gate-light {display:flex;align-items:center;gap:8px;border-radius:10px;padding:10px 12px;font:800 13px/1.3 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;border:1px solid var(--border);background:#fff;color:var(--sub);min-height:44px;transition:border-color .3s,color .3s,background .3s}.legacy-content .gate-light svg {flex:none}.legacy-content .gate-light.deny {border-color:rgba(220,38,38,.5);color:var(--danger);background:rgba(220,38,38,.05)}.legacy-content .gate-light.allow {border-color:rgba(22,163,74,.5);color:var(--success);background:rgba(22,163,74,.06)}.legacy-content .err-code {font:700 10.5px/1 ui-monospace,Menlo,monospace;border:1px solid rgba(220,38,38,.4);color:var(--danger);border-radius:999px;padding:4px 8px;display:none}.legacy-content .err-code.show {display:inline-block}.legacy-content .ed-status {margin-top:16px;min-height:56px;font-size:14px;color:var(--text);line-height:1.8;background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:16px 18px}.legacy-content .demo-note {font-size:12px;color:var(--sub);margin-top:12px;line-height:1.7}@media(max-width:760px){.legacy-content .facts {grid-template-columns:1fr}.legacy-content .ed-stage {grid-template-columns:1fr}.legacy-content .objective {grid-template-columns:1fr}.legacy-content .lesson-header:after {display:none}.legacy-content .demo-bar {flex-direction:column;align-items:stretch}.legacy-content .demo button {flex:1}.legacy-content .source-head {flex-direction:column}}

.legacy-content .xa-tldr {margin:18px 0 4px;padding:14px 18px;background:rgba(0,102,255,0.04);border:1px solid rgba(0,102,255,0.16);border-radius:10px}.legacy-content .xa-tldr .xa-tldr-tag {display:block;font-size:11px;font-weight:800;letter-spacing:1px;color:var(--accent,#0066ff);margin-bottom:6px}.legacy-content .xa-tldr p {margin:0;font-size:15px;line-height:1.8;color:var(--text,#1f2937)}